The below type of functionality build in could make life of applications
like phppgadmin and pgAdmin a touch easier.
That said, ODBC and libpq may be easily taught that it can treat SHOW
results like SELECT results.
> test=# select * from show_all_vars();
> varname | varval
> -------------------------------+---------------------------------------
> australian_timezones | off
> authentication_timeout | 60
> checkpoint_segments | 3